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首页> 外文期刊>Journal of Applied Polymer Science >Thermal and mechanical properties of poly(N-isopropylacrylamide)-based hydrogels as a function of porosity and medium change
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Thermal and mechanical properties of poly(N-isopropylacrylamide)-based hydrogels as a function of porosity and medium change

机译：聚（N-异丙基丙烯酰胺）基水凝胶的热力学性能与孔隙率和介质变化的关系

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摘要

Poly(N-isopropylacrylamide) (PNIPAAm) has been a well-known stimuli-responsive material and has been used in multiple novel applications. One of the key attributes to make the hydrogel more attractive is to control the response time and temperature. This work focused on comparing the physical properties, such as response time, transition temperature, heat of fusion, and mechanical strength, of macroporous and microporous PNIPAAm hydrogels, respectively. It was found that the macroporous hydrogels synthesized from a low-temperature polymerization with addition of tetramethyl orthosilicate exhibited a faster response time and superior mechanical strength. Furthermore, to modulate the transition temperature, both the macroporous and microporous hydrogels were subjected to different qualities of media by introducing a cosolvent (methanol) or an anionic surfactant (sodium dodecyl sulfate). Interestingly, addition of a cosolvent demonstrated a more pronounced effect on the macroporous hydrogel, whereas the surfactant resulted in a more pronounced effect on the microporous hydrogel. Such results revealed that based on their porosity; there were appreciable differences when the PNIPAAm hydrogels interacted with media molecules. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42776.
机译：聚（N-异丙基丙烯酰胺）（PNIPAAm）是一种众所周知的刺激反应材料，已用于多种新型应用中。使水凝胶更具吸引力的关键特性之一是控制响应时间和温度。这项工作的重点是分别比较大孔和微孔PNIPAAm水凝胶的物理性质，例如响应时间，转变温度，熔化热和机械强度。发现由低温聚合反应加入原硅酸四甲酯合成的大孔水凝胶表现出更快的响应时间和优异的机械强度。此外，为了调节转变温度，通过引入助溶剂（甲醇）或阴离子表面活性剂（十二烷基硫酸钠）使大孔和微孔水凝胶均经受不同质量的介质处理。有趣的是，添加助溶剂显示出对大孔水凝胶的更显着的作用，而表面活性剂导致对微孔水凝胶的更显着的作用。这样的结果表明，基于它们的孔隙率;当PNIPAAm水凝胶与介质分子相互作用时，存在明显差异。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42776。

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